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Model.)

J. P. PALMER.

PUMP.

Patented Aug. 7, 1894.

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' VUNITED STATES PATENT EEiCE.

JOHN F. PALMER,`OF RIVERSIDE, ILLINOIS.

Pu MP.

SPECIFICATION forming part of Letters Patent No. 524,184, dated August '7, 189,4.

Application ined sqptemterlz, 1892. semina/145,642. (No man.)

To ally/hom, it may concern.-

Be it known that I, JOHN F. PALMER, a citi- I zen of the United States, residing at River- .Tis

A primarily led to the production of the present invention. Pneumatic pumps for filling pneumatic tires must necessarily be of somewhat small dimension to t them for easy transportation in the saddle bag of the bicycle, but it has been found that the reduced size necessary underthese conditions involves also a material reduction in power; so

`that the charging of a pneumatic tire with a pump of a size suitable for easy transportation in the saddle bag has been a tedious and troublesome matter. Usually these pumps have been of the simple construction which involves a valved aperture and packed piston, and of course if the play of the piston is reduced the amount of air 'injected at each forward motion is likewise reduced. A double acting pump, or one inwhich air is forced out of the pump bot-h on the forward and backward motion of the piston, is objectionable' because the necesi-sary connections take up too `much space.

The object of my invention is to increase `the capacity without increasing the size of the pump when not in use, and to this end it `involves generally the adaptation of the double acting pump just mentioned to the conditions presented, wherein a limitation as to size is of paramount importance.

My invention consists in the general and specific construction and arrangement of parts, all as hereinafter more fully set forth.

The drawing is a vertical central section taken through a pump constructed in accordance with my invention.

A represents the outer cylinder and B the innercylinder of a pump constructed in accordance with my invention. At-its outerl adjacent to Whi'chperforation` are provided screw threaded enlargements s s', the former of which receives the needle or other syringe point, and the latter ofwhich receives one end of the externallyscrew threaded tube C which is located centrally Within the cylinder A. The opposite end of the tube C is also screw threaded and carries a leather piston head C'. Toward its outcr'extrem'itythe tube C is perforated as indicated at r to permit air to enter the tube and thus pass to the nozzle from' the interior of the cylinder A;

The inner cylinder B is closed at its outer end and provided with a suitable handle D, and is, of an external dimension to fit easily inder B is closed bythe head D' to which is secured an annular leather washer or pack- `in the cylinder A. "The inner end Vof the cyl'- ing ring E held in place by an annularplate i E of metal securedto the headD by screws p. The washers or packing rings E C are both of greater diameter than the cylinders into which they are introduced and turned `upat the edge, the ring 'E having its edge turned to point toward the nozzle and the?y ring C having its-edgeV turned to point yto'- ward the handle.

The operation will at once be apparent;V As

the tube Copens at one end into the cylinder B,at the other end into thenozzle, and at an intermediate point into the cylinder kA, forcing of the handle toward the nozzle, the cylinder A being held firmly in astationary position, will bring about a forcing of the air in I opposite directions in the cylinders respectively, the piston D forcing the airin the cylinder A through the apertures r and the piston C forcing the air in the cylinder B- into the end of the tube C. In this manner the air contained in the two cylinders yis at one motion forced through thenozzle, and yet when the pump is closed the length over all is very slightlyin excess of the length of the cylinder A. On withdrawing the handle D air is admitted respectively into the cylinders A and B through the space between the cylinders for the former and through an aperture o for the latter, the suction superinduced by the motion of the pistons and cylinders being such as to cause the air to pass around the leather Washers or packing rings.

As the device is shown in the drawing it is contemplated that the syringe nozzle which is to be attached to the pump at s shall be provided with the usual check valve, and hence no check valve is shown in the pump; but it will readily be understood that if it is intended to use the pump with a nozzle not so provided -With acheckvalve a check valve of any ordinary form may be placed Vin the opening shown at s or in any other satisfactory position. The form of handle D is a matter of no consequence, the illustration being arbitrary. l

Although as before stated this invention is contrived more particularly for use as a hand pump for charging pneumatic tires, and the like, it is by no means confined in this particular to this relation. All pumping apparatus for pumping air or other fluid may employ ythe important features of the present invention and such use is contemplated by me.

What I claim as new, and desire to secure z by Letters Patent, is-

1. A pump having telcscoping cylinders,

pistons Within said cylinders, and a tube fixed in and opening into one cylinderand passing through said pistons and opening into the other cylinder, whereby the discharge action of the pump forces the contained air from both cylinders at once through the tube, substantially as described.

2. A pump having telescoping cylinders, pistons within said cylinders, a dischargetube fixed at one end to communicate with the discharge-opening in the head of the outer cylinder and opening into the same and passing toward its opposite end through said pistons and opening into the inner cylinder, and air-inlets to the cylinders closed by the discharge-action of the pump, substantially as described.

3. An air-pump comprising, in combinainders and carrying one andpassi ng through the other of said pistons and opening immediately into the other of said cylinders, substantially as described.

4. An air-pumpV comprising, in combination, a cylinder A open at one end and having a Vperforated head t at the other, adischarge-tube C located Within the cylinder and discharging through the perforated head and communicating near one end with the interior of the cylinder A, and a movable cylinder B entering the cylinder A and into Which the inner end 'of the discharge-tube opens,

said inner cylinder being closed at one end and carrying at the other end a piston-head E, and a piston C on the discharge-tube in the cylinder B, and with relation to which said piston E is movable, substantially as described. l

5. A hand-pump comprising, in combination, an outer cylinder A having a nozzleopening at one end and open at the other, an inner cylinder B closed at one end, having at its other end a piston fitting Within the cylinder A a discharge-tube fastened at one end to the cylinder A at its nozzle-end and communicating therewith through an aperture r and extending into the cylinder B through the piston-end thereof and carrying at said end Within the cylinder B a piston, the bore of said tube affording communication between the cylinder B and the nozzle, substantially as described.

JOHN F. PALMER. In presence of M. J. FROST, M. E.' WINN. 

